a-a a-b a-i a-z aaa aab aai aan aar aaz ab- aba abb abi abn abr abz ai- aia aib aii ain air aiz an- ana anb ani ann anr anz ar- ara arb ari arn arr arz az- aza azb azi azn azz baa bab bai ban bar baz bba bbb bbi bbn bbr bi- bia bib bii bin bir biz bna bnb bni bnn bnr bnz bra brb bri brn brr brz bza bzn bzr bzz ia- iaa iab iai ian iar iaz iba ibb ibi ibn ibr ibz iia iib iii iin iir in- ina inb ini inn inr ir- ira irb iri irn irr iza izi izz n-i naa nab nai nan nar naz nba nbb nbi nbn nbr nia nib nii nin nir niz nna nnb nni nnn nnz nra nrb nri nrn nrr nrz nzb nzi nzz ra- raa rab rai ran rar raz rba rbb rbi rbn rbr ria rib rii rin rir riz rna rnb rni rnn rnr rnz rra rrb rri rrn rrr rza rzb zaa zab zai zan zar zaz zbb zbr zia zib zin zir ziz znn zzr zzz